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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/8921

Title: Potassium (K plus ) gradients serve as a mobile energy source in plant vascular tissues
Authors: Gajdanowicz, P.
Michard, E.
Sandmann, M.
Rocha, M.
Correa, L.G.G.
Ramirez-Aguilar, S.J.
Gomez-Porras, J.L.
Gonzalez, W.
Thibaud, J.B .
van Dongen, J.T.
Dreyer, I.
Keywords: channel gating
energy limiting condition
phloem reloading
posttranslational regulation
potassium channel
Issue Date: Jan-2011
Citation: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Volume: 108 Issue: 2 Pages: 864-869 DOI: 10.1073/pnas.100977710
Abstract: The essential mineral nutrient potassium (K(+)) is the most important inorganic cation for plants and is recognized as a limiting factor for crop yield and quality. Nonetheless, it is only partially understood how K(+) contributes to plant productivity. K(+) is used as a major active solute to maintain turgor and to drive irreversible and reversible changes in cell volume. K(+) also plays an important role in numerous metabolic processes, for example, by serving as an essential cofactor of enzymes. Here, we provide evidence for an additional, previously unrecognized role of K(+) in plant growth. By combining diverse experimental approaches with computational cell simulation, we show that K(+) circulating in the phloem serves as a decentralized energy storage that can be used to overcome local energy limitations. Posttranslational modification of the phloem-expressed Arabidopsis K(+) channel AKT2 taps this "potassium battery," which then efficiently assists the plasma membrane H(+)-ATPase in energizing the transmembrane phloem (re) loading processes.
Description: Gonzalez, W (Gonzalez, Wendy).Univ Talca, Ctr Bioinformat & Simulac Mol, Talca, Chile
URI: http://dspace.utalca.cl/handle/1950/8921
ISSN: 0027-8424
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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